Bulk processing of HgBaCuO high T/sub c/ superconductors by a two-zone technique

Author

Wolters, C. ; Amm, K.M. ; Sun, Y.R. ; Schwartz, J.

Author_Institution

Nat. High Magnetic Field Lab., Florida State Univ., Tallahassee, FL, USA

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1506

Lastpage

1509

Abstract

Hg1201 superconductors have been synthesized from Ba-Cu-O precursors in a two zone assembly. Critical temperatures of 92 K as prepared and 95 K after oxygen annealing resulted. The Hg1201 phase forms at mercury pressures above 6 bar (800/spl deg/C) and at temperatures between 750/spl deg/C and 850/spl deg/C. The effect of dopants on melting and annealing temperatures of the precursor materials has also been studied. After Li doping of up to 20%, melting peaks shift to lower temperatures and broaden significantly.<>

Keywords

annealing; barium compounds; high-temperature superconductors; impurities; lithium; mercury compounds; superconducting transition temperature; zone melting; 6 bar; 750 to 850 C; 92 K; 95 K; HgBa/sub 2/CuO; HgBa/sub 2/CuO:Li; Li doping; annealing; annealing temperature; critical temperature; dopant effect; melting temperature; two-zone technique; Annealing; Assembly; Doping; Heating; High temperature superconductors; Land surface temperature; Mercury (metals); Superconducting materials; Superconducting transition temperature; Superconductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402857

Filename

402857